package org.apache.solr.spelling.suggest.fst;

import org.apache.lucene.search.suggest.Lookup;
import org.apache.lucene.search.suggest.fst.*;
import org.apache.solr.common.util.NamedList;
import org.apache.solr.core.SolrCore;
import org.apache.solr.spelling.suggest.LookupFactory;

/**
 * Factory for {@link WFSTCompletionLookup}
 * @lucene.experimental
 */
public class WFSTLookupFactory extends LookupFactory {

    /**
     * If
     * <code>true</code>, exact suggestions are returned first, even if they are
     * prefixes of other strings in the automaton (possibly with larger
     * weights).
     */
    public static final String EXACT_MATCH_FIRST = "exactMatchFirst";
    /**
     * File name for the automaton.
     *
     */
    private static final String FILENAME = "wfst.bin";

    @Override
    public Lookup create(NamedList params, SolrCore core) {
        boolean exactMatchFirst = params.get(EXACT_MATCH_FIRST) != null
                ? Boolean.valueOf(params.get(EXACT_MATCH_FIRST).toString())
                : true;

        return new WFSTCompletionLookup(exactMatchFirst);
    }

    @Override
    public String storeFileName() {
        return FILENAME;
    }
}
